God made each of us moral beings with the ability to choose between right and wrong.
Our conscience helps us decide the precepts of right and wrong.
Prov. 20:27
Gen. 2:3
Rom. 2:14 - All people are born with a right and wrong moral concept.
Heb. 9:14
1 Tim. 1:18
1 Tim. 3:9
Heb. 13:18
1 Sam. 16:23
If we ignore our conscience we will eventually become calloused to sin.